Search found 349 matches

by thunderstorm80
Sep 19 2019 12:07pm
Forum: Battery Technology
Topic: Paralleling LiFe with Li-Ion - How to match the discharge curves?
Replies: 4
Views: 182

Re: Paralleling LiFe with Li-Ion - How to match the discharge curves?

You really can't match those discharge curves. But if you must run that way, run till voltages match, then connect. Run till the A123's are empty, Then STOP. I seriously doubt your GA's are waiting. But current will flow both ways, depending on the needs. Its near impossible to see what is really h...
by thunderstorm80
Sep 18 2019 7:02am
Forum: Battery Technology
Topic: Paralleling LiFe with Li-Ion - How to match the discharge curves?
Replies: 4
Views: 182

Paralleling LiFe with Li-Ion - How to match the discharge curves?

Hi, My main battery is A123 79V 20Ah. On long distances, I add 72V 23Ah Li-Ion battery with GA cells which on the paper is excellent in capacity and supplement the more powerful (but heavier) A123. On practice, the A123 has a flat discharge curve (~3.3V through most of the SOC) while a standard Li-I...
by thunderstorm80
Aug 05 2019 4:34am
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 50
Views: 2818

Re: A portable gasoline generator for long range

Re the running costs. yeah, gas is about 4 cents a mile for the Suzuki, 65 mpg makes the gas cost little. And gas is again dirt cheap in the USA. But to go 80 miles per charge, over a mountain or two, then you don't get an e bike for 1500 bucks. More like that just for battery, and needing it repla...
by thunderstorm80
Jul 28 2019 1:42am
Forum: Battery Technology
Topic: Considering BMS (or just monitoring) for LiFe cells
Replies: 7
Views: 315

Re: Considering BMS (or just monitoring) for LiFe cells

I will move to 18650 and get a BT bms at that point. I just don't know which cell will last and not have mega voltage sag. A123 lifepo4 iis pretty flat discharge. And big and heavy. How many amps at discharge and charge ? On the 25S E-bike, with two DD motors, the peak discharge current reaches 110...
by thunderstorm80
Jul 26 2019 2:54am
Forum: Battery Technology
Topic: Considering BMS (or just monitoring) for LiFe cells
Replies: 7
Views: 315

Re: Considering BMS (or just monitoring) for LiFe cells

I just have 4-6s sense wires and monitor with a cellog. And use a una9 plus+ thru the sense wire balance charger if ever needed. Maybe 4 - 6 times. With my ping. One channel on the bms drain one cell to zero. Ouch bms no thanks. Sorry me no like bms. I can regen 1,000 watts how would a bms like tha...
by thunderstorm80
Jul 26 2019 2:38am
Forum: E-Bike Technical
Topic: A Phaserunner-like controller with 12FETs ?
Replies: 5
Views: 361

Re: A Phaserunner-like controller with 12FETs ?

Just spoke to Justin about it, and he says they will get few units of those and flash them with their firmware, compatible with their suite. But the BacDoor signal connector will still be the same...
by thunderstorm80
Jul 26 2019 2:36am
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 50
Views: 2818

Re: A portable gasoline generator for long range

Quick math. If my ebike cost me $1500 and I've ridden 9000 miles on it, ignoring the approximately $35 spent in electricity, I've spent 16.6 cents/mile. Realistically, my ebike has probably cost me more than $1500 If I were to consider all maintenance and all the various things I've experimented wi...
by thunderstorm80
Jul 25 2019 11:13am
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 50
Views: 2818

Re: A portable gasoline generator for long range

Got to agree with the get a motorcycle idea. I gave up the idea of really long range e biking, and got a 400cc scooter. FWIW, because I'm a safe bet for insurance, (old fart) including insurance its only costing me about 15 cents a mile. That's just about half the cost per mile of my 80 mile range ...
by thunderstorm80
Jul 25 2019 10:52am
Forum: Battery Technology
Topic: Considering BMS (or just monitoring) for LiFe cells
Replies: 7
Views: 315

Re: Considering BMS (or just monitoring) for LiFe cells

I have a 6 year old maybe 7 year old A123 20 ah 24s pack 1,389 cycles. Charge to 3.5 discharge to 2.9v at most . A couple times I've drained them to there was no power. This was the only times I balanced charged after bulk charging. After many problems with bms on my ping I gave of for now. Just do...
by thunderstorm80
Jul 24 2019 3:13pm
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 50
Views: 2818

Re: A portable gasoline generator for long range

If that gets tiring, maybe a recumbent is an option for you? A good one will cut your watt hours per mile in half. A really good one will do better than that. There are also things you can do to increase the aerodynamics of upright bikes. I dream of recumbent... More comfortable on long range, and ...
by thunderstorm80
Jul 24 2019 12:31pm
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 50
Views: 2818

Re: A portable gasoline generator for long range

It's been some time, and eventually I solved the problem using a secondary battery: The primary battery is 24S LiFe that can "tolerate" the harsh currents (including regen), and it's much heavier than the secondary. The secondary is lightweight GA cells based battery that supplements the primary - i...
by thunderstorm80
Jul 24 2019 12:16pm
Forum: E-Bike Technical
Topic: A Phaserunner-like controller with 12FETs ?
Replies: 5
Views: 361

A Phaserunner-like controller with 12FETs ?

Hi,
Anyone know of such animal?
A controller which is sinusoidal, voltage->torque mapped, can actually PERFORM regen WELL (unlike the Infineons), and can be fully programmed.
Grin doesn't plan on making a bigger version soon...
by thunderstorm80
Jul 24 2019 12:14pm
Forum: Battery Technology
Topic: Considering BMS (or just monitoring) for LiFe cells
Replies: 7
Views: 315

Considering BMS (or just monitoring) for LiFe cells

Hello, I use 20Ah A123 prismatic cells on almost all my E-bikes. I never used a BMS, since the cells are very similar to each other, and I do a check-up and an individual 3.6V top-charge every few months. Recently I start to think over about the BMS thing as the cells start to age (6 years but still...
by thunderstorm80
Dec 19 2018 3:11am
Forum: Motor Technology
Topic: An idea how to make sure there is no ingested water inside a motor
Replies: 3
Views: 345

An idea how to make sure there is no ingested water inside a motor

Hi, No matter what tight sealing you have, water/humidity will always find it's way into a motor due to pressure breathing. I've had two ideas how you can negate the water issue. 1. What if, after every rainy ride, you would induce the motor's windings to a series of heating&cooling phases by provid...
by thunderstorm80
Nov 25 2018 1:16pm
Forum: E-Bike Technical
Topic: How to make EVERYTHING truly waterproof
Replies: 6
Views: 561

Re: How to make EVERYTHING truly waterproof

If you open up a common throttle, you might see three soldered connections from the wires to the PCB. Sice a throttle only uses 5V at very-low amps, the entire parts assembly can be potted by covering everything in epoxy, hot glue, clear fingernail polish, etc. Of course you can also use electricia...
by thunderstorm80
Nov 25 2018 10:26am
Forum: Battery Technology
Topic: Charging two 36V batteries using the Cycle-Satiator
Replies: 1
Views: 261

Charging two 36V batteries using the Cycle-Satiator

Hi, I bought two Hailong 36V23Ah packs from Grin, and these are configured in series (with pass-diode) at 72V. Using two 72V5A Satiator chargers would let me max out the chargers at a steady 720W (360*2) from 50% SOC and above. (3.6V@cell@50% - 20*3.6=72V * 5 = 360W for each unit) The problem is tha...
by thunderstorm80
Nov 25 2018 9:53am
Forum: E-Bike Technical
Topic: How to make EVERYTHING truly waterproof
Replies: 6
Views: 561

How to make EVERYTHING truly waterproof

Hi, What contraptions/installations you use to prevent water from reaching your entire electric gear on your bikes? I am mostly talking about the Cycle Analyst JST connectors, but also about throttles, any handle-bar mounted switches, and of course the motor. I am using a GrinHub on the front wheel ...
by thunderstorm80
Nov 16 2018 10:05pm
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 50
Views: 2818

Re: A portable gasoline generator for long range

I believe that the best machine has no moving parts. Windows and transformers are good examples of doing a job without moving parts. I would take a slight turn from the original direction here, and suggest a small fuel cell could be running at full power while traveling, with good efficiency and li...
by thunderstorm80
Nov 16 2018 5:44pm
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 50
Views: 2818

Re: A portable gasoline generator for long range

My so far working practical solution, which works well at the moment, is using 4 Satiator-chargers as one big brick. I can rapidly charge at any place with electricity at 360*4=1440W of power. (But only because my battery can accept that fast charge rate without being deteriorated) That is great - ...
by thunderstorm80
Nov 16 2018 5:38pm
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 50
Views: 2818

Re: A portable gasoline generator for long range

I'm not suggesting that a push trailer is the solution for this project, but they do exist: https://endless-sphere.com/forums/viewtopic.php?f=3&t=9855 A hub-motor like this will have a hard time pushing a fully loaded touring bike on it's own due to lack of traction, but if it's an additional motor...
by thunderstorm80
Nov 16 2018 5:29pm
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 50
Views: 2818

Re: A portable gasoline generator for long range

Do you know of a small generator (that can produce about 700W) so that it won't be so heavy? For that you don't want a generator. You want a direct drive gas engine, geared for cruising speed (i.e. 25mph.) If you have a DD hub motor you already have a generator. You might consider a pusher trailer ...
by thunderstorm80
Nov 16 2018 5:23pm
Forum: E-Bike Technical
Topic: Why do Fat-tires have higher rolling resistance?
Replies: 27
Views: 1638

Re: Why do Fat-tires have higher rolling resistance?

Tire shock attenuation is too complex for easy analysis. Suffice it to say that in the same way a 1.9" tire at 65 psi can be an overall harder ride, but still better when bad stuff happens compared to say, a 1" tire at 100 psi; a big ole fat 3-4" tire when "overinflated" to 20-35 psi can be uncompl...
by thunderstorm80
Nov 16 2018 7:06am
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 50
Views: 2818

A portable gasoline generator for long range

Hi, For short rides without pedaling, or long ones where you do most of the pedal work at slow speeds - the current Lithium batteries are enough. But for very long ranges, or if you want to be able to cover a huge distance as a commuting route and do it fast (like 40-50kph), batteries are not enough...
by thunderstorm80
Nov 12 2018 2:56pm
Forum: E-Bike Technical
Topic: Why do Fat-tires have higher rolling resistance?
Replies: 27
Views: 1638

Re: Why do Fat-tires have higher rolling resistance?

Wow... must say I learned a lot from this thread! I still think, and correct me if I am wrong, that fatty tires are the only reliable option for "full" suspension (albeit without the damper) when you tour with a heavy loaded bike - both front panniers and rear. Full suspension bikes just can't handl...
by thunderstorm80
Nov 08 2018 7:41am
Forum: E-Bike Technical
Topic: What's the best E-bike bicycle type for touring+camping?
Replies: 2
Views: 345

Re: What's the best E-bike bicycle type for touring+camping?

What do you think? Would you go with the Fat-Bike, or the Touring-Bike? Touring frames generally are longer wheelbase, for heavy-loaded stability and pannier/heal clearance, plus they have all the braze-on mounts for racks, bottles, mudguards. You want all these things if you're touring. Lots of to...